Centrifugal pump.



w. A. DOBLE.

CENTRIFUGAL PUMP.

APPLICATION FILED JUNE 2, I9I3.

1,220,403., Patented Manz?, 1917.

0" /ll I MQW Y CENTRIFUGAI. PUMP.

Specification of Letters Patent. Patented Miam'. 2'?, 191

weones.

Y Application led J' une 2, 1913. Serial No. 771,307.

tion 18 which gradually tapers on both sides in the direction vof the axis of the valve. The casing'lG is provided with a contracted portion 19which is of just sufficient size to permit the enlarged portion 18 of the valve to enterl therein.V The casing is also pro- To all whom z't may concern:

Be it known that I, WILLIAM A. DOBLE, a citizen of the UnitedStates, residing at converted into pressure. trolling the opening between the casing the quantity of discharge and the lift of the pump may be varied at will without the production of eddy discharge stream and with currents in the no destructive effect thereon.

In Fig. 2 I have shown a modification of my invention in which the pump casing has been extended to form a discharge conduit, a portion of which forms a valve casing in which I.place a valve similar to that shown in Fig.- 1 and having similar operating means. This Lconstruction is obviouslyless expensive than that shown in Fig. 1 and eliminates the joint between the valve casing land the discharge conduit. I have shown the valve in Fig. 2 in the closed position, and it will be seen that the valve is opened by a rearward movement thereof to the dotcertain new and useful Improvements in his invention relates to pumps and more f throwing type. elicient `means proxlmately the samev area as the discharge pumps.

stuiiing'box 22 in the h igher it is deslrable to change the quaneretofore this has been done by providing of the valve casing for operating the valve. charged liquid is throttled by a sudden condotted position in the contracted-portion 19 action in the valve and also an early destruccontracted until the valve enters the portion duit a needle-gate valve which is so arranged transformed into velocity and after passing formed luto pressure again.

taken in connection with the accompanying ing aneedle-gate valve in a casing which is Flg. 2 shows a modification in which the Referring to the drawings the numeral 10 mounted on a shaft 12. The discharge conwall of this conduit is provided with an eX- the valve casing 16. Within the valve casing ted position.

an Francisco, in the county of'San Francisco and State of California, have invented Centrifugal Pumps, ofj which the following is a specification.

particularly to pumps of the centrifugal or 4' l 4 The object of the invention tween the valve and the casing will be of ap- 1s to provide 'suitable and m for controlling the capacity and lift of such conduit 13. Th lve has a rearwardly In many cases where a pump is proJecting stem 21 which passes through a used to lift a liquid from a lower level to a 1s provided with means, such as the hand tlty of liquid lifted or the height of the lift. Wheel 23 and screw thread 24, on the exterior` in the discharge conduit leading from the It will be seen that as the valve is moved pump, an ordinary valve in which the disfrom the positlon shown in Fig. 1 toward the traction of the discharge area. The result 0f the valve casing the annular area between is an unnecessary loss o energy due to eddy the casing and the valve will be gradually tion of the valve. To overcome these dis- 19 when the opening will be practically advantages I provide in the discharge conclosed. This construction provides for the gradual increase in the veloclty of the liquid that the pressure of the liquid is gradually the smallest area by which the capacity is controlled the velocity is gradually trans- The novel features of the invention will be apparent from the following description drawings, in which:

Figure 1 shows a centrifugal pump havadapted to be bolted or otherwise secured to the discharge outlet of the pump. discharge conduit of thepump is extended and the valve arranged dlrectly therein. indicates the pump casing and 11 indicates the rotary member of the pump which 1s duit is indicated at 13 and in the embodiment of the invention shown in Fig. 1 the teriorly arranged flange 14, to which isbolted or otherwise secured the flange 15 of is a needle valve 17 having an enlarged porwall of the casing and Having thus described the invention what with said valve and respectively provide a I claim as new and desire to secure by Letsubstantially closed and a fulldischarge l5 ters-Patent is: opening, and said valve being provided with In combination, a centrifugal pump ina stem extending rearwardly therefrom and cluding a rotary member and a casing thereto the exterior of said conduit and provided for, said casing having a discharge'conduit with means for actuating said valve.

formed integral therewith and having its In testimony whereof I aiiix my signature 20 outlet adapted for connection to a discharge in presence of two witnesses.

pipe and a needle valve extending long1- tudiilally of said conduit, said casing hav- WILLIAM A' DOBLE' ing a restricted portion and an enlarged por- Witnesses:

tion through both of which said valve may ARTHUR L. BRYANT,

be moved and which are adapted to coact JOHN M. Corr. 

